Update understanding-security-alerts.md

[rlitinsky]

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[DeCohen]

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[garycentric]

@rlitinsky Please work with the private repo, defender-docs-pr, not the public. The private repos have more thorough checks, more support for Microsoft contributors, and a shorter path to being published. If you need help, please post in https://aka.ms/AskAnAdmin in Teams. You can also find guidance in the authoring guide in Get started for contributors with write access and Quickly update an article using the Microsoft Learn Editor or GitHub.com.